W215B 데이터 시트보기 (PDF) - Cypress Semiconductor

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W215B

Notebook PC System Frequency Generator for K6 Processors

Cypress Semiconductor 

PRELIMINARY

W215B

I/O APIC Clock Output (Test Load: R = 33Ω; C = 22 pF)

Parameter

Description

f

Frequency, Actual

tR

Output Rise Edge Rate

tF

Output Fall Edge Rate

tD

Duty Cycle

fST

Frequency Stabilization

from Power-up (cold start)

Zo

AC Output Impedance

Test Condition/Comments

Frequency generated by crystal oscillator

Measured on rising and falling edge at 1.5V

Assumes full supply voltage reached within

1 ms from power-up. Short cycles exist prior to

frequency stabilization.

Average value during switching transition.

Used for determining series termination value.

CPU = 100 MHz

Min. Typ. Max.

14.31818

1

4

1

4

45

50

55

1.5

15

Unit

MHz

V/ns

V/ns

%

ms

Ω

REF0 Clock Output (Test Load: R = 33Ω; C = 22 pF)

Parameter

Description

Test Condition/Comments

f

Frequency, Actual

Frequency generated by crystal oscillator

tR

Output Rise Edge Rate

Measured from 0.4V to 2.4V

tF

Output Fall Edge Rate

Measured from 2.4V to 0.4V

tD

Duty Cycle

Measured on rising and falling edge at 1.5V

fST

Frequency Stabilization from Assumes full supply voltage reached within 1 ms

Power-up (cold start)

from power-up. Short cycles exist prior to

frequency stabilization.

Zo

AC Output Impedance

Average value during switching transition. Used for

determining series termination value.

CPU = 100 MHz

Min. Typ. Max.

14.318

1

4

1

4

45 50 55

1.5

16

Unit

MHz

V/ns

V/ns

%

ms

Ω

REF1 Clock Output (Lump Capacitance Test Load = 20 pF)

Parameter

Description

Test Condition/Comments

f

Frequency, Actual

Frequency generated by crystal oscillator

tR

Output Rise Edge Rate

tF

Output Fall Edge Rate

tD

Duty Cycle

Measured on rising and falling edge at 1.5V

fST

Frequency Stabilization from Assumes full supply voltage reached within 1 ms

Power-up (cold start)

from power-up. Short cycles exist prior to

frequency stabilization.

Zo

AC Output Impedance

Average value during switching transition. Used for

determining series termination value.

CPU = 100 MHz

Min. Typ. Max.

14.318

0.5

2

0.5

2

45

55

1.5

25

Unit

MHz

V/ns

V/ns

%

ms

Ω

10

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